package com.kaifamiao.N0820;

import java.util.LinkedHashMap;

public class Node1 {

    public static void main(String[] args) {

        LinkedHashMap node = new LinkedHashMap();

        node.put("e",5);
        node.put("a",1);
        node.put("c",3);

        System.out.println(node.keySet());

        System.out.println(node.get("e") );

        System.out.println(node.containsValue(7));

    }
}
